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Pals Status Pages

Pseudowire And LDP-enabled Services (Active WG)
Rtg Area: Alvaro Retana, Deborah Brungard, Martin Vigoureux | 2014-Oct-31 —  

2020-01-10 charter

Pseudowire And LDP-enabled Services (pals)


 Current Status: Active

     Andrew G. Malis <agmalis@gmail.com>
     Stewart Bryant <stewart.bryant@gmail.com>

 Routing Area Directors:
     Deborah Brungard <db3546@att.com>
     Alvaro Retana <aretana.ietf@gmail.com>
     Martin Vigoureux <martin.vigoureux@nokia.com>

 Routing Area Advisor:
     Deborah Brungard <db3546@att.com>

     Dave Sinicrope <david.sinicrope@ericsson.com>

 Mailing Lists:
     General Discussion: pals@ietf.org
     To Subscribe:       https://www.ietf.org/mailman/listinfo/pals
     Archive:            https://mailarchive.ietf.org/arch/browse/pals/

Description of Working Group:

  Many services that run in the Internet are facilitated in MPLS networks
  by the Label Distribution Protocol (LDP) and/or are established over
  pseudowires that emulate point-to-point or point-to-multipoint links and
  provide communication connectivity that is perceived by its users as an
  unshared link or circuit of an emulated Layer-1, Layer-2, or Layer-3
  service type.

  Layer-2 Virtual Private Networks (L2VPNs) are one such service that
  provides an emulation of a "native" service over a packet switched
  network that is adequately faithful to, but may not be entirely
  indistinguishable from, the native service itself.

  The Pseudowire And LDP-enabled Services (PALS) working group is
  chartered to define, specify, and extend network services based on
  pseudowires and/or signaled using LDP.

  In particular, the working group will work on the following services:

  - All types of MPLS-based and L2TPv3-based pseudowire services
    including point-to-point and point-to-multipoint pseudowires, single
    segment and multi-segment pseudowires, single and multi-domain
    pseudowires, and signaled and statically provisioned pseudowires.

  - All types of dynamic or static provider-provisioned L2VPNs that
    operate over pseudowires or that are enabled over MPLS networks
    using LDP as a control plane mechanism.

  - IP-only L2VPN solutions (for IP-only services over a packet switched

  The working group may also suggest new services to be supported by LDP
  or pseudowires and these may be added to the working group charter
  subject to re-chartering. The working group is also responsible for the
  maintenance and development of pseudowires formerly carried out by the
  PWE3 working group

  The PALS working group will not define any mechanisms that exert control
  over the underlying packet switched network. When necessary it may,
  however, recommend or require the use of existing QoS and path control
  mechanisms between the edge nodes that provide the connectivity to the

  The working group may work on:

  - New pseudowire encapsulations or types for services emulated over
    IETF-specified Packet Switched Networks.

  - Operations, Administration, and Management (OAM) for pseudowires
    including interworking of OAM for pseudowires and native services, and
    OAM for other services worked on by PALS (including L2VPNs). But new
    techniques should be shared with the BFD and MPLS working groups to
    ensure consistency with existing OAM techniques, and with the LIME
    working group to provide for consistency of operation.

  - Protocol extensions for LDP in support of new pseudowire function
    and new services, but all protocol extensions must be reviewed by the
    MPLS working group which is responsible for the consistency and
    stability of LDP.

  - Mechanisms to enhance pseudowire and L2VPN functionality by
    including security, protection and restoration, congestion avoidance,
    and load balancing across parallel packet switched tunnels.

  - Mechanisms to permit optimization of multicast data traffic within an

  - Enhancements to increase the scalability of the control plane and data
    plane of L2VPN solutions and application of L2VPN solutions in the
    data center, the latter in coordination with the NVO3 working group

  - L2VPN discovery and membership mechanisms that utilize pseudowire
    control and management procedures.

  - Data models for modeling, managing, and operating the services worked
    on by the PALS working group using SMI or YANG.

  The PALS working group will not work on L2VPNs enabled using BGP, and
  where L2VPNs that are within the scope of the PALS working group use
  BGP to add functionality (for example for discovery of membership of a
  VPN) this work will be coordinated with the BESS working group. This
  also includes work on particular types of L2VPNs that support both LDP
  and BGP signaling, such as VPLS. Any contention between these working
  groups on the placement of such work will be resolved by the chairs.

  The PALS working group will coordinate closely with the MPLS working
  group for all work involving LDP and the MPLS data plane. It will also
  coordinate with the MPLS working group in developing shared security,
  and with the BFD and MPLS working groups on OAM solutions.

  Where extensions to pseudowires are needed to support time or frequency
  transfer, this work will be done by the PALS working group in
  consultation with the TICTOC working group.

  L2TP specifics of L2TPv3-based pseudowires will continue to be the
  responsibility of the L2TPEXT working group.

Goals and Milestones:
  Jun 2016 - Submit LDP-VPLS for Ethernet Broadcast and Multicast to the IESG
  Jun 2017 - Submit L2VPN applicability statement for data center applications to the IESG
  Done     - Submit PW Congestion Considerations to the IESG
  Done     - Submit STP Application of ICCP to the IESG
  Done     - Submit Pseudowire Redundancy on S-PE to the IESG
  Done     - Submit Unified Control Channel for PWs to the IESG
  Done     - Submit MAC Address Withdrawal over Static Pseudowire to the IESG
  Done     - Submit S-PE resilience for statically provisioned MS-PWs to the IESG
  Done     - Submit LDP extensions for PW Binding to LSP Tunnels to the IESG
  Done     - Submit PW Endpoint Fast Failure Protection to the IESG
  Done     - Submit P2MP PW Signaling (root initiated) to the IESG
  Done     - Submit MPLS LSP PW status refresh reduction for Static PWs to the IESG
  Done     - Submit PIM Snooping over VPLS to the IESG
  Done     - Submit E-Tree Support in VPLS to the IESG jointly with the BESS WG
  Work transferred to the BESS working group     - Submit YANG data model for SS-PWs and MS-PWs to the IESG

All charter page changes, including changes to draft-list, rfc-list and milestones:

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